Thyroid and Parathyroid Hormones

What are the functions and effects of the thyroid hormone (T₃ and T₄)?

• Type: Amino acid–based but acts like a lipid-soluble hormone

• Function: Increases metabolism, energy use, heart rate, and body temperature

What is calcitonin and what does it do?

• Produced by: Parafollicular (C) cells of the thyroid

• Type: Peptide (amino acid–based)

• Function: Lowers blood calcium levels by reducing bone breakdown and increasing calcium excretion by the kidneys

What is PTH and what does it do?

• Parathyroid Hormone (PTH) is a protein hormone produced by the chief cells of the parathyroid glands.

• Function: Increases blood calcium by:
  

  • Stimulating bone breakdown

  • Increasing calcium reabsorption in the kidneys

  • Enhancing calcium absorption in the intestines (via vitamin D)

You got this?

Yes